911uk

996 Brake booster replacement??

Add to repair workspace

New repair projectOpen repair workspace

Original source

3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH996 Brake booster replacement??

Leading reported evidence

Disconnect any pipes and leaving the hydraulics in tact

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
I've read that the the brake system needs to be split, but I wondered if there is enough movement in the master cylinder and pipes to change the booster without disconnecting any pipes and leaving the hydraulics in tact?
Original post Read captured discussion
996 Brake booster replacement??

Read full discussion summary

Leading evidence: 'Disconnect any pipes and leaving the hydraulics in tact' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect any pipes and leaving the hydraulics in tact' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

Read captured replies

1 matching discussions · 3 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Replace booster without

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
I've read that the the brake system needs to be split, but I wondered if there is enough movement in the master cylinder and pipes to change the booster without disconnecting any pipes and leaving the hydraulics in tact?
Original post Read captured discussion
996 Brake booster replacement??

Replace brake booster

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
I am looking to replace the brake booster on my 996 C2 (1999).
Original post Read captured discussion
996 Brake booster replacement??

Frequently discussed actions (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Disconnect any pipes and leaving the hydraulics in tact

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
I've read that the the brake system needs to be split, but I wondered if there is enough movement in the master cylinder and pipes to change the booster without disconnecting any pipes and leaving the hydraulics in tact?
Original post Read captured discussion
996 Brake booster replacement??

Replace booster without

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
I've read that the the brake system needs to be split, but I wondered if there is enough movement in the master cylinder and pipes to change the booster without disconnecting any pipes and leaving the hydraulics in tact?
Original post Read captured discussion
996 Brake booster replacement??

Replace brake booster

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
I am looking to replace the brake booster on my 996 C2 (1999).
Original post Read captured discussion
996 Brake booster replacement??

Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

911uk: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261027T031046Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi, I am looking to replace the brake booster on my 996 C2 (1999). Diaphragm failure I think.. (Lots of hissing from booster and a hard brake pedal. Still got vacuum at check valve) I've read that the the brake system needs to be split, but I wondered if there is enough movement in the master cylinder and pipes to change the booster without disconnecting any pipes and leaving the hydraulics in tact? Any advice would be gratefully received... Many thanks Steven Clarke Migration info. Legacy thread was 54348

POST 2Original post

Hi Steven and welcome. The 2 best sources on tech info are Rennlist and our very own 911Doctor. You could try PMing the Doc. I had a GF who suffered diaphragm failure once and caused lots of worry for a few weeks - but that's another story. Good luck Migration info. Legacy thread was 54353

POST 3 / ORIGINAL POSTEROriginal post

Thankyou. Will try those. Migration info. Legacy thread was 54354

This is a source reference. Confirm exact model applicability in the original material.